%%%------------------------------------------------------------------- %%% File: erlydtl_compiler.erl %%% @author Roberto Saccon [http://rsaccon.com] %%% @author Evan Miller %%% @copyright 2008 Roberto Saccon, Evan Miller %%% @doc %%% ErlyDTL template compiler %%% @end %%% %%% The MIT License %%% %%% Copyright (c) 2007 Roberto Saccon, Evan Miller %%% %%% Permission is hereby granted, free of charge, to any person obtaining a copy %%% of this software and associated documentation files (the "Software"), to deal %%% in the Software without restriction, including without limitation the rights %%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell %%% copies of the Software, and to permit persons to whom the Software is %%% furnished to do so, subject to the following conditions: %%% %%% The above copyright notice and this permission notice shall be included in %%% all copies or substantial portions of the Software. %%% %%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR %%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, %%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE %%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER %%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, %%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN %%% THE SOFTWARE. %%% %%% @since 2007-12-16 by Roberto Saccon, Evan Miller %%%------------------------------------------------------------------- -module(erlydtl_compiler). -author('rsaccon@gmail.com'). -author('emmiller@gmail.com'). %% -------------------------------------------------------------------- %% Definitions %% -------------------------------------------------------------------- -export([compile/2, compile/3, compile_dir/2, compile_dir/3, parse/1]). -record(dtl_context, { local_scopes = [], block_dict = dict:new(), blocktrans_fun = none, blocktrans_locales = [], auto_escape = off, doc_root = "", parse_trail = [], vars = [], filter_modules = [], custom_tags_dir = [], custom_tags_modules = [], reader = {file, read_file}, module = [], compiler_options = [verbose, report_errors], binary_strings = true, force_recompile = false, locale = none, is_compiling_dir = false}). -record(ast_info, { dependencies = [], translatable_strings = [], translated_blocks= [], custom_tags = [], var_names = [], pre_render_asts = []}). -record(treewalker, { counter = 0, safe = false }). compile(Binary, Module) when is_binary(Binary) -> compile(Binary, Module, []); compile(File, Module) -> compile(File, Module, []). compile(Binary, Module, Options) when is_binary(Binary) -> File = "", CheckSum = "", case parse(Binary) of {ok, DjangoParseTree} -> case compile_to_binary(File, DjangoParseTree, init_dtl_context(File, Module, Options), CheckSum) of {ok, Module1, _} -> {ok, Module1}; Err -> Err end; Err -> Err end; compile(File, Module, Options) -> Context = init_dtl_context(File, Module, Options), case parse(File, Context) of ok -> ok; {ok, DjangoParseTree, CheckSum} -> case compile_to_binary(File, DjangoParseTree, Context, CheckSum) of {ok, Module1, Bin} -> write_binary(Module1, Bin, Options); Err -> Err end; Err -> Err end. compile_dir(Dir, Module) -> compile_dir(Dir, Module, []). compile_dir(Dir, Module, Options) -> Context = init_dtl_context_dir(Dir, Module, Options), Files = filelib:fold_files(Dir, ".*", true, fun(F1,Acc1) -> [F1 | Acc1] end, []), {ParserResults, ParserErrors} = lists:foldl(fun (File, {ResultAcc, ErrorAcc}) -> case filename:basename(File) of "."++_ -> {ResultAcc, ErrorAcc}; _ -> FilePath = filename:absname(File), case filelib:is_dir(FilePath) of true -> {ResultAcc, ErrorAcc}; false -> case parse(FilePath, Context) of ok -> {ResultAcc, ErrorAcc}; {ok, DjangoParseTree, CheckSum} -> {[{File, DjangoParseTree, CheckSum}|ResultAcc], ErrorAcc}; Err -> {ResultAcc, [Err|ErrorAcc]} end end end end, {[], []}, Files), case ParserErrors of [] -> case compile_multiple_to_binary(Dir, ParserResults, Context) of {ok, Module1, Bin} -> write_binary(Module1, Bin, Options); Err -> Err end; [Error|_] -> Error end. %%==================================================================== %% Internal functions %%==================================================================== write_binary(Module1, Bin, Options) -> case proplists:get_value(out_dir, Options) of undefined -> ok; OutDir -> BeamFile = filename:join([OutDir, atom_to_list(Module1) ++ ".beam"]), case file:write_file(BeamFile, Bin) of ok -> ok; {error, Reason} -> {error, lists:concat(["beam generation failed (", Reason, "): ", BeamFile])} end end. compile_multiple_to_binary(Dir, ParserResults, Context) -> {Functions, {AstInfo, _}} = lists:mapfoldl(fun({File, DjangoParseTree, CheckSum}, {AstInfo, TreeWalker}) -> FilePath = full_path(File, Context#dtl_context.doc_root), {{BodyAst, BodyInfo}, TreeWalker1} = with_dependency({FilePath, CheckSum}, body_ast(DjangoParseTree, Context, TreeWalker)), FunctionName = filename:rootname(filename:basename(File)), Function1 = erl_syntax:function(erl_syntax:atom(FunctionName), [erl_syntax:clause([erl_syntax:variable("Variables")], none, [erl_syntax:application(none, erl_syntax:atom(FunctionName), [erl_syntax:variable("Variables"), erl_syntax:atom(none)])])]), Function2 = erl_syntax:function(erl_syntax:atom(FunctionName), [erl_syntax:clause([erl_syntax:variable("Variables"), erl_syntax:variable("TranslationFun")], none, [BodyAst])]), {{FunctionName, Function1, Function2}, {merge_info(AstInfo, BodyInfo), TreeWalker1}} end, {#ast_info{}, #treewalker{}}, ParserResults), Forms = custom_forms(Dir, Context#dtl_context.module, Functions, AstInfo), compile_forms_and_reload(Dir, Forms, Context#dtl_context.compiler_options). compile_to_binary(File, DjangoParseTree, Context, CheckSum) -> try body_ast(DjangoParseTree, Context, #treewalker{}) of {{BodyAst, BodyInfo}, BodyTreeWalker} -> try custom_tags_ast(BodyInfo#ast_info.custom_tags, Context, BodyTreeWalker) of {{CustomTagsAst, CustomTagsInfo}, _} -> Forms = forms(File, Context#dtl_context.module, {BodyAst, BodyInfo}, {CustomTagsAst, CustomTagsInfo}, Context#dtl_context.binary_strings, CheckSum), compile_forms_and_reload(File, Forms, Context#dtl_context.compiler_options) catch throw:Error -> Error end catch throw:Error -> Error end. compile_forms_and_reload(File, Forms, CompilerOptions) -> case compile:forms(Forms, CompilerOptions) of {ok, Module1, Bin} -> code:purge(Module1), case code:load_binary(Module1, atom_to_list(Module1) ++ ".erl", Bin) of {module, _} -> {ok, Module1, Bin}; _ -> {error, lists:concat(["code reload failed: ", Module1])} end; error -> {error, lists:concat(["compilation failed: ", File])}; OtherError -> OtherError end. init_dtl_context(File, Module, Options) when is_list(Module) -> init_dtl_context(File, list_to_atom(Module), Options); init_dtl_context(File, Module, Options) -> Ctx = #dtl_context{}, #dtl_context{ parse_trail = [File], module = Module, doc_root = proplists:get_value(doc_root, Options, filename:dirname(File)), filter_modules = proplists:get_value(custom_filters_modules, Options, Ctx#dtl_context.filter_modules) ++ [erlydtl_filters], custom_tags_dir = proplists:get_value(custom_tags_dir, Options, filename:join([erlydtl_deps:get_base_dir(), "priv", "custom_tags"])), custom_tags_modules = proplists:get_value(custom_tags_modules, Options, Ctx#dtl_context.custom_tags_modules), blocktrans_fun = proplists:get_value(blocktrans_fun, Options, Ctx#dtl_context.blocktrans_fun), blocktrans_locales = proplists:get_value(blocktrans_locales, Options, Ctx#dtl_context.blocktrans_locales), vars = proplists:get_value(vars, Options, Ctx#dtl_context.vars), reader = proplists:get_value(reader, Options, Ctx#dtl_context.reader), compiler_options = proplists:get_value(compiler_options, Options, Ctx#dtl_context.compiler_options), binary_strings = proplists:get_value(binary_strings, Options, Ctx#dtl_context.binary_strings), force_recompile = proplists:get_value(force_recompile, Options, Ctx#dtl_context.force_recompile), locale = proplists:get_value(locale, Options, Ctx#dtl_context.locale), is_compiling_dir = false}. init_dtl_context_dir(Dir, Module, Options) when is_list(Module) -> init_dtl_context_dir(Dir, list_to_atom(Module), Options); init_dtl_context_dir(Dir, Module, Options) -> Ctx = #dtl_context{}, #dtl_context{ parse_trail = [], module = Module, doc_root = proplists:get_value(doc_root, Options, Dir), filter_modules = proplists:get_value(custom_filters_modules, Options, Ctx#dtl_context.filter_modules) ++ [erlydtl_filters], custom_tags_dir = proplists:get_value(custom_tags_dir, Options, filename:join([erlydtl_deps:get_base_dir(), "priv", "custom_tags"])), custom_tags_modules = proplists:get_value(custom_tags_modules, Options, Ctx#dtl_context.custom_tags_modules), blocktrans_fun = proplists:get_value(blocktrans_fun, Options, Ctx#dtl_context.blocktrans_fun), blocktrans_locales = proplists:get_value(blocktrans_locales, Options, Ctx#dtl_context.blocktrans_locales), vars = proplists:get_value(vars, Options, Ctx#dtl_context.vars), reader = proplists:get_value(reader, Options, Ctx#dtl_context.reader), compiler_options = proplists:get_value(compiler_options, Options, Ctx#dtl_context.compiler_options), binary_strings = proplists:get_value(binary_strings, Options, Ctx#dtl_context.binary_strings), force_recompile = proplists:get_value(force_recompile, Options, Ctx#dtl_context.force_recompile), locale = proplists:get_value(locale, Options, Ctx#dtl_context.locale), is_compiling_dir = true}. is_up_to_date(_, #dtl_context{force_recompile = true}) -> false; is_up_to_date(CheckSum, Context) -> Module = Context#dtl_context.module, {M, F} = Context#dtl_context.reader, case catch Module:source() of {_, CheckSum} -> case catch Module:dependencies() of L when is_list(L) -> RecompileList = lists:foldl(fun ({XFile, XCheckSum}, Acc) -> case catch M:F(XFile) of {ok, Data} -> case binary_to_list(erlang:md5(Data)) of XCheckSum -> Acc; _ -> [recompile | Acc] end; _ -> [recompile | Acc] end end, [], L), case RecompileList of [] -> true; _ -> false end; _ -> false end; _ -> false end. parse(File, Context) -> {M, F} = Context#dtl_context.reader, case catch M:F(File) of {ok, Data} -> CheckSum = binary_to_list(erlang:md5(Data)), case parse(CheckSum, Data, Context) of {error, Msg} when is_list(Msg) -> {error, File ++ ": " ++ Msg}; {error, Msg} -> {error, {File, [Msg]}}; Result -> Result end; _ -> {error, {File, [{0, Context#dtl_context.module, "Failed to read file"}]}} end. parse(CheckSum, Data, Context) -> case is_up_to_date(CheckSum, Context) of true -> ok; _ -> case parse(Data) of {ok, Val} -> {ok, Val, CheckSum}; Err -> Err end end. parse(Data) -> case erlydtl_scanner:scan(binary_to_list(Data)) of {ok, Tokens} -> erlydtl_parser:parse(Tokens); Err -> Err end. custom_tags_ast(CustomTags, Context, TreeWalker) -> {{CustomTagsClauses, CustomTagsInfo}, TreeWalker1} = custom_tags_clauses_ast(CustomTags, Context, TreeWalker), {{erl_syntax:function(erl_syntax:atom(render_tag), CustomTagsClauses), CustomTagsInfo}, TreeWalker1}. custom_tags_clauses_ast(CustomTags, Context, TreeWalker) -> custom_tags_clauses_ast1(CustomTags, [], [], #ast_info{}, Context, TreeWalker). custom_tags_clauses_ast1([], _ExcludeTags, ClauseAcc, InfoAcc, _Context, TreeWalker) -> {{lists:reverse([erl_syntax:clause([erl_syntax:underscore(), erl_syntax:underscore(), erl_syntax:underscore()], none, [erl_syntax:list([])])|ClauseAcc]), InfoAcc}, TreeWalker}; custom_tags_clauses_ast1([Tag|CustomTags], ExcludeTags, ClauseAcc, InfoAcc, Context, TreeWalker) -> case lists:member(Tag, ExcludeTags) of true -> custom_tags_clauses_ast1(CustomTags, ExcludeTags, ClauseAcc, InfoAcc, Context, TreeWalker); false -> CustomTagFile = full_path(Tag, Context#dtl_context.custom_tags_dir), case parse(CustomTagFile, Context) of {ok, DjangoParseTree, CheckSum} -> {{BodyAst, BodyAstInfo}, TreeWalker1} = with_dependency({CustomTagFile, CheckSum}, body_ast(DjangoParseTree, Context, TreeWalker)), Clause = erl_syntax:clause([erl_syntax:string(Tag), erl_syntax:variable("Variables"), options_ast()], none, [BodyAst]), custom_tags_clauses_ast1(CustomTags, [Tag|ExcludeTags], [Clause|ClauseAcc], merge_info(BodyAstInfo, InfoAcc), Context, TreeWalker1); Error -> throw(Error) end end. dependencies_function(Dependencies) -> erl_syntax:function( erl_syntax:atom(dependencies), [erl_syntax:clause([], none, [erl_syntax:list(lists:map(fun ({XFile, XCheckSum}) -> erl_syntax:tuple([erl_syntax:string(XFile), erl_syntax:string(XCheckSum)]) end, Dependencies))])]). translatable_strings_function(TranslatableStrings) -> erl_syntax:function( erl_syntax:atom(translatable_strings), [erl_syntax:clause([], none, [erl_syntax:list(lists:map(fun(String) -> erl_syntax:string(String) end, TranslatableStrings))])]). translated_blocks_function(TranslatedBlocks) -> erl_syntax:function( erl_syntax:atom(translated_blocks), [erl_syntax:clause([], none, [erl_syntax:list(lists:map(fun(String) -> erl_syntax:string(String) end, TranslatedBlocks))])]). custom_forms(Dir, Module, Functions, AstInfo) -> ModuleAst = erl_syntax:attribute(erl_syntax:atom(module), [erl_syntax:atom(Module)]), ExportAst = erl_syntax:attribute(erl_syntax:atom(export), [erl_syntax:list([ erl_syntax:arity_qualifier(erl_syntax:atom(source_dir), erl_syntax:integer(0)), erl_syntax:arity_qualifier(erl_syntax:atom(dependencies), erl_syntax:integer(0)), erl_syntax:arity_qualifier(erl_syntax:atom(translatable_strings), erl_syntax:integer(0)) | lists:foldl(fun({FunctionName, _, _}, Acc) -> [erl_syntax:arity_qualifier(erl_syntax:atom(FunctionName), erl_syntax:integer(1)), erl_syntax:arity_qualifier(erl_syntax:atom(FunctionName), erl_syntax:integer(2))|Acc] end, [], Functions)] )]), SourceFunctionAst = erl_syntax:function( erl_syntax:atom(source_dir), [erl_syntax:clause([], none, [erl_syntax:string(Dir)])]), DependenciesFunctionAst = dependencies_function(AstInfo#ast_info.dependencies), TranslatableStringsFunctionAst = translatable_strings_function(AstInfo#ast_info.translatable_strings), FunctionAsts = lists:foldl(fun({_, Function1, Function2}, Acc) -> [Function1, Function2 | Acc] end, [], Functions), [erl_syntax:revert(X) || X <- [ModuleAst, ExportAst, SourceFunctionAst, DependenciesFunctionAst, TranslatableStringsFunctionAst | FunctionAsts] ++ AstInfo#ast_info.pre_render_asts]. forms(File, Module, {BodyAst, BodyInfo}, {CustomTagsFunctionAst, CustomTagsInfo}, BinaryStrings, CheckSum) -> MergedInfo = merge_info(BodyInfo, CustomTagsInfo), Render0FunctionAst = erl_syntax:function(erl_syntax:atom(render), [erl_syntax:clause([], none, [erl_syntax:application(none, erl_syntax:atom(render), [erl_syntax:list([])])])]), Render1FunctionAst = erl_syntax:function(erl_syntax:atom(render), [erl_syntax:clause([erl_syntax:variable("Variables")], none, [erl_syntax:application(none, erl_syntax:atom(render), [erl_syntax:variable("Variables"), erl_syntax:list([])])])]), Function2 = erl_syntax:application(none, erl_syntax:atom(render_internal), [erl_syntax:variable("Variables"), erl_syntax:application( erl_syntax:atom(proplists), erl_syntax:atom(get_value), [erl_syntax:atom(translation_fun), erl_syntax:variable("Options"), erl_syntax:atom(none)]), erl_syntax:application( erl_syntax:atom(proplists), erl_syntax:atom(get_value), [erl_syntax:atom(locale), erl_syntax:variable("Options"), erl_syntax:atom(none)]), erl_syntax:application( erl_syntax:atom(proplists), erl_syntax:atom(get_value), [erl_syntax:atom(custom_tags_context), erl_syntax:variable("Options"), erl_syntax:atom(none)]) ]), ClauseOk = erl_syntax:clause([erl_syntax:variable("Val")], none, [erl_syntax:tuple([erl_syntax:atom(ok), erl_syntax:variable("Val")])]), ClauseCatch = erl_syntax:clause([erl_syntax:variable("Err")], none, [erl_syntax:tuple([erl_syntax:atom(error), erl_syntax:variable("Err")])]), Render2FunctionAst = erl_syntax:function(erl_syntax:atom(render), [erl_syntax:clause([erl_syntax:variable("Variables"), erl_syntax:variable("Options")], none, [erl_syntax:try_expr([Function2], [ClauseOk], [ClauseCatch])])]), SourceFunctionTuple = erl_syntax:tuple( [erl_syntax:string(File), erl_syntax:string(CheckSum)]), SourceFunctionAst = erl_syntax:function( erl_syntax:atom(source), [erl_syntax:clause([], none, [SourceFunctionTuple])]), DependenciesFunctionAst = dependencies_function(MergedInfo#ast_info.dependencies), TranslatableStringsAst = translatable_strings_function(MergedInfo#ast_info.translatable_strings), TranslatedBlocksAst = translated_blocks_function(MergedInfo#ast_info.translated_blocks), BodyAstTmp = erl_syntax:application( erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(stringify_final), [BodyAst, erl_syntax:atom(BinaryStrings)]), RenderInternalFunctionAst = erl_syntax:function( erl_syntax:atom(render_internal), [erl_syntax:clause([erl_syntax:variable("Variables"), erl_syntax:variable("TranslationFun"), erl_syntax:variable("CurrentLocale"), erl_syntax:variable("CustomTagsContext")], none, [BodyAstTmp])]), ModuleAst = erl_syntax:attribute(erl_syntax:atom(module), [erl_syntax:atom(Module)]), ExportAst = erl_syntax:attribute(erl_syntax:atom(export), [erl_syntax:list([erl_syntax:arity_qualifier(erl_syntax:atom(render), erl_syntax:integer(0)), erl_syntax:arity_qualifier(erl_syntax:atom(render), erl_syntax:integer(1)), erl_syntax:arity_qualifier(erl_syntax:atom(render), erl_syntax:integer(2)), erl_syntax:arity_qualifier(erl_syntax:atom(source), erl_syntax:integer(0)), erl_syntax:arity_qualifier(erl_syntax:atom(dependencies), erl_syntax:integer(0)), erl_syntax:arity_qualifier(erl_syntax:atom(translatable_strings), erl_syntax:integer(0)), erl_syntax:arity_qualifier(erl_syntax:atom(translated_blocks), erl_syntax:integer(0)) ])]), [erl_syntax:revert(X) || X <- [ModuleAst, ExportAst, Render0FunctionAst, Render1FunctionAst, Render2FunctionAst, SourceFunctionAst, DependenciesFunctionAst, TranslatableStringsAst, TranslatedBlocksAst, RenderInternalFunctionAst, CustomTagsFunctionAst | BodyInfo#ast_info.pre_render_asts]]. % child templates should only consist of blocks at the top level body_ast([{'extends', {string_literal, _Pos, String}} | ThisParseTree], Context, TreeWalker) -> File = full_path(unescape_string_literal(String), Context#dtl_context.doc_root), case lists:member(File, Context#dtl_context.parse_trail) of true -> throw({error, "Circular file inclusion!"}); _ -> case parse(File, Context) of {ok, ParentParseTree, CheckSum} -> BlockDict = lists:foldl( fun ({block, {identifier, _, Name}, Contents}, Dict) -> dict:store(Name, Contents, Dict); (_, Dict) -> Dict end, dict:new(), ThisParseTree), with_dependency({File, CheckSum}, body_ast(ParentParseTree, Context#dtl_context{ block_dict = dict:merge(fun(_Key, _ParentVal, ChildVal) -> ChildVal end, BlockDict, Context#dtl_context.block_dict), parse_trail = [File | Context#dtl_context.parse_trail]}, TreeWalker)); Err -> throw(Err) end end; body_ast(DjangoParseTree, Context, TreeWalker) -> {AstInfoList, TreeWalker2} = lists:mapfoldl( fun ({'autoescape', {identifier, _, OnOrOff}, Contents}, TreeWalkerAcc) -> body_ast(Contents, Context#dtl_context{auto_escape = OnOrOff}, TreeWalkerAcc); ({'block', {identifier, _, Name}, Contents}, TreeWalkerAcc) -> Block = case dict:find(Name, Context#dtl_context.block_dict) of {ok, ChildBlock} -> ChildBlock; _ -> Contents end, body_ast(Block, Context, TreeWalkerAcc); ({'blocktrans', Args, Contents}, TreeWalkerAcc) -> blocktrans_ast(Args, Contents, Context, TreeWalkerAcc); ({'call', {identifier, _, Name}}, TreeWalkerAcc) -> call_ast(Name, TreeWalkerAcc); ({'call', {identifier, _, Name}, With}, TreeWalkerAcc) -> call_with_ast(Name, With, Context, TreeWalkerAcc); ({'comment', _Contents}, TreeWalkerAcc) -> empty_ast(TreeWalkerAcc); ({'cycle', Names}, TreeWalkerAcc) -> cycle_ast(Names, Context, TreeWalkerAcc); ({'cycle_compat', Names}, TreeWalkerAcc) -> cycle_compat_ast(Names, Context, TreeWalkerAcc); ({'date', 'now', {string_literal, _Pos, FormatString}}, TreeWalkerAcc) -> now_ast(FormatString, Context, TreeWalkerAcc); ({'filter', FilterList, Contents}, TreeWalkerAcc) -> filter_tag_ast(FilterList, Contents, Context, TreeWalkerAcc); ({'firstof', Vars}, TreeWalkerAcc) -> firstof_ast(Vars, Context, TreeWalkerAcc); ({'for', {'in', IteratorList, Variable}, Contents}, TreeWalkerAcc) -> {EmptyAstInfo, TreeWalker1} = empty_ast(TreeWalkerAcc), for_loop_ast(IteratorList, Variable, Contents, EmptyAstInfo, Context, TreeWalker1); ({'for', {'in', IteratorList, Variable}, Contents, EmptyPartContents}, TreeWalkerAcc) -> {EmptyAstInfo, TreeWalker1} = body_ast(EmptyPartContents, Context, TreeWalkerAcc), for_loop_ast(IteratorList, Variable, Contents, EmptyAstInfo, Context, TreeWalker1); ({'if', Expression, Contents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1), ifelse_ast(Expression, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifchanged', Contents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1), ifchanged_ast(Contents, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifchangedelse', IfContents, ElseContents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context, TreeWalker1), ifchanged_ast(IfContents, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifelse', Expression, IfContents, ElseContents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context, TreeWalker1), ifelse_ast(Expression, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifequal', [Arg1, Arg2], Contents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1), ifelse_ast({'expr', "eq", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifequalelse', [Arg1, Arg2], IfContents, ElseContents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context,TreeWalker1), ifelse_ast({'expr', "eq", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifnotequal', [Arg1, Arg2], Contents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1), ifelse_ast({'expr', "ne", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'ifnotequalelse', [Arg1, Arg2], IfContents, ElseContents}, TreeWalkerAcc) -> {IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc), {ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context, TreeWalker1), ifelse_ast({'expr', "ne", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2); ({'include', {string_literal, _, File}, Args}, TreeWalkerAcc) -> include_ast(unescape_string_literal(File), Args, Context#dtl_context.local_scopes, Context, TreeWalkerAcc); ({'include_only', {string_literal, _, File}, Args}, TreeWalkerAcc) -> include_ast(unescape_string_literal(File), Args, [], Context, TreeWalkerAcc); ({'regroup', {ListVariable, {identifier, _, Attribute}, {identifier, _, NewVariable}}, Contents}, TreeWalkerAcc) -> regroup_ast(ListVariable, Attribute, NewVariable, Contents, Context, TreeWalkerAcc); ({'spaceless', Contents}, TreeWalkerAcc) -> spaceless_ast(Contents, Context, TreeWalkerAcc); ({'ssi', Arg}, TreeWalkerAcc) -> ssi_ast(Arg, Context, TreeWalkerAcc); ({'ssi_parsed', {string_literal, _, FileName}}, TreeWalkerAcc) -> include_ast(unescape_string_literal(FileName), [], Context#dtl_context.local_scopes, Context, TreeWalkerAcc); ({'string', _Pos, String}, TreeWalkerAcc) -> string_ast(String, Context, TreeWalkerAcc); ({'tag', {identifier, _, Name}, Args}, TreeWalkerAcc) -> tag_ast(Name, Args, Context, TreeWalkerAcc); ({'templatetag', {_, _, TagName}}, TreeWalkerAcc) -> templatetag_ast(TagName, Context, TreeWalkerAcc); ({'trans', Value}, TreeWalkerAcc) -> translated_ast(Value, Context, TreeWalkerAcc); ({'widthratio', Numerator, Denominator, Scale}, TreeWalkerAcc) -> widthratio_ast(Numerator, Denominator, Scale, Context, TreeWalkerAcc); ({'with', Args, Contents}, TreeWalkerAcc) -> with_ast(Args, Contents, Context, TreeWalkerAcc); (ValueToken, TreeWalkerAcc) -> {{ValueAst,ValueInfo},ValueTreeWalker} = value_ast(ValueToken, true, Context, TreeWalkerAcc), {{format(ValueAst, Context, ValueTreeWalker),ValueInfo},ValueTreeWalker} end, TreeWalker, DjangoParseTree), {AstList, {Info, TreeWalker3}} = lists:mapfoldl( fun({Ast, Info}, {InfoAcc, TreeWalkerAcc}) -> PresetVars = lists:foldl(fun (X, Acc) -> case proplists:lookup(X, Context#dtl_context.vars) of none -> Acc; Val -> [erl_syntax:abstract(Val) | Acc] end end, [], Info#ast_info.var_names), case PresetVars of [] -> {Ast, {merge_info(Info, InfoAcc), TreeWalkerAcc}}; _ -> Counter = TreeWalkerAcc#treewalker.counter, Name = lists:concat([pre_render, Counter]), Ast1 = erl_syntax:application(none, erl_syntax:atom(Name), [erl_syntax:list(PresetVars)]), PreRenderAst = erl_syntax:function(erl_syntax:atom(Name), [erl_syntax:clause([erl_syntax:variable("Variables")], none, [Ast])]), PreRenderAsts = Info#ast_info.pre_render_asts, Info1 = Info#ast_info{pre_render_asts = [PreRenderAst | PreRenderAsts]}, {Ast1, {merge_info(Info1, InfoAcc), TreeWalkerAcc#treewalker{counter = Counter + 1}}} end end, {#ast_info{}, TreeWalker2}, AstInfoList), {{erl_syntax:list(AstList), Info}, TreeWalker3}. value_ast(ValueToken, AsString, Context, TreeWalker) -> case ValueToken of {'expr', Operator, Value} -> {{ValueAst,InfoValue}, TreeWalker1} = value_ast(Value, false, Context, TreeWalker), Ast = erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(Operator), [ValueAst]), {{Ast, InfoValue}, TreeWalker1}; {'expr', Operator, Value1, Value2} -> {{Value1Ast,InfoValue1}, TreeWalker1} = value_ast(Value1, false, Context, TreeWalker), {{Value2Ast,InfoValue2}, TreeWalker2} = value_ast(Value2, false, Context, TreeWalker1), Ast = erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(Operator), [Value1Ast, Value2Ast]), {{Ast, merge_info(InfoValue1,InfoValue2)}, TreeWalker2}; {'string_literal', _Pos, String} -> string_ast(unescape_string_literal(String), Context, TreeWalker); {'number_literal', _Pos, Number} -> case AsString of true -> string_ast(Number, Context, TreeWalker); false -> {{erl_syntax:integer(list_to_integer(Number)), #ast_info{}}, TreeWalker} end; {'apply_filter', Variable, Filter} -> filter_ast(Variable, Filter, Context, TreeWalker); {'attribute', _} = Variable -> {Ast, VarName} = resolve_variable_ast(Variable, Context), {{Ast, #ast_info{var_names = [VarName]}}, TreeWalker}; {'variable', _} = Variable -> {Ast, VarName} = resolve_variable_ast(Variable, Context), {{Ast, #ast_info{var_names = [VarName]}}, TreeWalker} end. merge_info(Info1, Info2) -> #ast_info{ dependencies = lists:merge( lists:sort(Info1#ast_info.dependencies), lists:sort(Info2#ast_info.dependencies)), var_names = lists:merge( lists:sort(Info1#ast_info.var_names), lists:sort(Info2#ast_info.var_names)), translatable_strings = lists:merge( lists:sort(Info1#ast_info.translatable_strings), lists:sort(Info2#ast_info.translatable_strings)), translated_blocks = lists:merge( lists:sort(Info1#ast_info.translated_blocks), lists:sort(Info2#ast_info.translated_blocks)), custom_tags = lists:merge( lists:sort(Info1#ast_info.custom_tags), lists:sort(Info2#ast_info.custom_tags)), pre_render_asts = lists:merge( Info1#ast_info.pre_render_asts, Info2#ast_info.pre_render_asts)}. with_dependencies([], Args) -> Args; with_dependencies([Dependency | Rest], Args) -> with_dependencies(Rest, with_dependency(Dependency, Args)). with_dependency(FilePath, {{Ast, Info}, TreeWalker}) -> {{Ast, Info#ast_info{dependencies = [FilePath | Info#ast_info.dependencies]}}, TreeWalker}. empty_ast(TreeWalker) -> {{erl_syntax:list([]), #ast_info{}}, TreeWalker}. blocktrans_ast(ArgList, Contents, Context, TreeWalker) -> {NewScope, {ArgInfo, TreeWalker1}} = lists:mapfoldl(fun ({{identifier, _, LocalVarName}, Value}, {AstInfo1, TreeWalker1}) -> {{Ast, Info}, TreeWalker2} = value_ast(Value, false, Context, TreeWalker1), {{LocalVarName, Ast}, {merge_info(AstInfo1, Info), TreeWalker2}} end, {#ast_info{}, TreeWalker}, ArgList), NewContext = Context#dtl_context{ local_scopes = [NewScope|Context#dtl_context.local_scopes] }, SourceText = lists:flatten(erlydtl_unparser:unparse(Contents)), {{DefaultAst, AstInfo}, TreeWalker2} = body_ast(Contents, NewContext, TreeWalker1), MergedInfo = merge_info(AstInfo, ArgInfo), case Context#dtl_context.blocktrans_fun of none -> {{DefaultAst, MergedInfo}, TreeWalker2}; BlockTransFun when is_function(BlockTransFun) -> {FinalAstInfo, FinalTreeWalker, Clauses} = lists:foldr(fun(Locale, {AstInfoAcc, ThisTreeWalker, ClauseAcc}) -> case BlockTransFun(SourceText, Locale) of default -> {AstInfoAcc, ThisTreeWalker, ClauseAcc}; Body -> {ok, DjangoParseTree} = parse(Body), {{ThisAst, ThisAstInfo}, TreeWalker3} = body_ast(DjangoParseTree, NewContext, ThisTreeWalker), {merge_info(ThisAstInfo, AstInfoAcc), TreeWalker3, [erl_syntax:clause([erl_syntax:string(Locale)], none, [ThisAst])|ClauseAcc]} end end, {MergedInfo, TreeWalker2, []}, Context#dtl_context.blocktrans_locales), Ast = erl_syntax:case_expr(erl_syntax:variable("CurrentLocale"), Clauses ++ [erl_syntax:clause([erl_syntax:underscore()], none, [DefaultAst])]), {{Ast, FinalAstInfo#ast_info{ translated_blocks = [SourceText] }}, FinalTreeWalker} end. translated_ast({string_literal, _, String}, Context, TreeWalker) -> NewStr = unescape_string_literal(String), DefaultString = case Context#dtl_context.locale of none -> NewStr; Locale -> erlydtl_i18n:translate(NewStr,Locale) end, translated_ast2(erl_syntax:string(NewStr), erl_syntax:string(DefaultString), #ast_info{translatable_strings = [NewStr]}, TreeWalker); translated_ast(ValueToken, Context, TreeWalker) -> {{Ast, Info}, TreeWalker1} = value_ast(ValueToken, true, Context, TreeWalker), translated_ast2(Ast, Ast, Info, TreeWalker1). translated_ast2(NewStrAst, DefaultStringAst, AstInfo, TreeWalker) -> StringLookupAst = erl_syntax:application( erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(translate), [NewStrAst, erl_syntax:variable("TranslationFun"), DefaultStringAst]), {{StringLookupAst, AstInfo}, TreeWalker}. % Completely unnecessary in ErlyDTL (use {{ "{%" }} etc), but implemented for compatibility. templatetag_ast('openblock', Context, TreeWalker) -> string_ast("{%", Context, TreeWalker); templatetag_ast('closeblock', Context, TreeWalker) -> string_ast("%}", Context, TreeWalker); templatetag_ast('openvariable', Context, TreeWalker) -> string_ast("{{", Context, TreeWalker); templatetag_ast('closevariable', Context, TreeWalker) -> string_ast("}}", Context, TreeWalker); templatetag_ast('openbrace', Context, TreeWalker) -> string_ast("{", Context, TreeWalker); templatetag_ast('closebrace', Context, TreeWalker) -> string_ast("}", Context, TreeWalker); templatetag_ast('opencomment', Context, TreeWalker) -> string_ast("{#", Context, TreeWalker); templatetag_ast('closecomment', Context, TreeWalker) -> string_ast("#}", Context, TreeWalker). widthratio_ast(Numerator, Denominator, Scale, Context, TreeWalker) -> {{NumAst, NumInfo}, TreeWalker1} = value_ast(Numerator, false, Context, TreeWalker), {{DenAst, DenInfo}, TreeWalker2} = value_ast(Denominator, false, Context, TreeWalker1), {{ScaleAst, ScaleInfo}, TreeWalker3} = value_ast(Scale, false, Context, TreeWalker2), {{format_number_ast(erl_syntax:application( erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(widthratio), [NumAst, DenAst, ScaleAst])), merge_info(ScaleInfo, merge_info(NumInfo, DenInfo))}, TreeWalker3}. binary_string(String) -> erl_syntax:binary([erl_syntax:binary_field(erl_syntax:integer(X)) || X <- String]). string_ast(String, #dtl_context{ binary_strings = true }, TreeWalker) -> {{binary_string(String), #ast_info{}}, TreeWalker}; string_ast(String, #dtl_context{ binary_strings = false }, TreeWalker) -> {{erl_syntax:string(String), #ast_info{}}, TreeWalker}. %% less verbose AST, better for development and debugging include_ast(File, ArgList, Scopes, Context, TreeWalker) -> FilePath = full_path(File, Context#dtl_context.doc_root), case parse(FilePath, Context) of {ok, InclusionParseTree, CheckSum} -> {NewScope, {ArgInfo, TreeWalker1}} = lists:mapfoldl(fun ({{identifier, _, LocalVarName}, Value}, {AstInfo1, TreeWalker1}) -> {{Ast, Info}, TreeWalker2} = value_ast(Value, false, Context, TreeWalker1), {{LocalVarName, Ast}, {merge_info(AstInfo1, Info), TreeWalker2}} end, {#ast_info{}, TreeWalker}, ArgList), {{BodyAst, BodyInfo}, TreeWalker2} = with_dependency({FilePath, CheckSum}, body_ast(InclusionParseTree, Context#dtl_context{ parse_trail = [FilePath | Context#dtl_context.parse_trail], local_scopes = [NewScope|Scopes] }, TreeWalker1)), {{BodyAst, merge_info(BodyInfo, ArgInfo)}, TreeWalker2}; Err -> throw(Err) end. % include at run-time ssi_ast(FileName, Context, TreeWalker) -> {{Ast, Info}, TreeWalker1} = value_ast(FileName, true, Context, TreeWalker), {Mod, Fun} = Context#dtl_context.reader, {{erl_syntax:application( erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(read_file), [erl_syntax:atom(Mod), erl_syntax:atom(Fun), erl_syntax:string(Context#dtl_context.doc_root), Ast]), Info}, TreeWalker1}. filter_tag_ast(FilterList, Contents, Context, TreeWalker) -> {{InnerAst, Info}, TreeWalker1} = body_ast(Contents, Context#dtl_context{auto_escape = did}, TreeWalker), {{FilteredAst, FilteredInfo}, TreeWalker2} = lists:foldl(fun ([{identifier, _, 'escape'}], {{AstAcc, InfoAcc}, TreeWalkerAcc}) -> {{AstAcc, InfoAcc}, TreeWalkerAcc#treewalker{safe = true}}; ([{identifier, _, 'safe'}], {{AstAcc, InfoAcc}, TreeWalkerAcc}) -> {{AstAcc, InfoAcc}, TreeWalkerAcc#treewalker{safe = true}}; ([{identifier, _, 'safeseq'}], {{AstAcc, InfoAcc}, TreeWalkerAcc}) -> {{AstAcc, InfoAcc}, TreeWalkerAcc#treewalker{safe = true}}; (Filter, {{AstAcc, InfoAcc}, TreeWalkerAcc}) -> {Ast, AstInfo} = filter_ast1(Filter, AstAcc, Context), {{Ast, merge_info(InfoAcc, AstInfo)}, TreeWalkerAcc} end, {{erl_syntax:application( erl_syntax:atom(erlang), erl_syntax:atom(iolist_to_binary), [InnerAst]), Info}, TreeWalker1}, FilterList), EscapedAst = case search_for_escape_filter(lists:reverse(FilterList), Context) of on -> erl_syntax:application( erl_syntax:atom(erlydtl_filters), erl_syntax:atom(force_escape), [FilteredAst]); _ -> FilteredAst end, {{EscapedAst, FilteredInfo}, TreeWalker2}. search_for_escape_filter(FilterList, #dtl_context{auto_escape = on}) -> search_for_safe_filter(FilterList); search_for_escape_filter(_, #dtl_context{auto_escape = did}) -> off; search_for_escape_filter([[{identifier, _, 'escape'}]|Rest], _Context) -> search_for_safe_filter(Rest); search_for_escape_filter([_|Rest], Context) -> search_for_escape_filter(Rest, Context); search_for_escape_filter([], _Context) -> off. search_for_safe_filter([[{identifier, _, 'safe'}]|_]) -> off; search_for_safe_filter([[{identifier, _, 'safeseq'}]|_]) -> off; search_for_safe_filter([_|Rest]) -> search_for_safe_filter(Rest); search_for_safe_filter([]) -> on. filter_ast(Variable, Filter, Context, TreeWalker) -> % the escape filter is special; it is always applied last, so we have to go digging for it % AutoEscape = 'did' means we (will have) decided whether to escape the current variable, % so don't do any more escaping {{UnescapedAst, Info}, TreeWalker2} = filter_ast_noescape(Variable, Filter, Context#dtl_context{auto_escape = did}, TreeWalker), EscapedAst = case search_for_escape_filter(Variable, Filter, Context) of on -> erl_syntax:application( erl_syntax:atom(erlydtl_filters), erl_syntax:atom(force_escape), [UnescapedAst]); _ -> UnescapedAst end, {{EscapedAst, Info}, TreeWalker2}. filter_ast_noescape(Variable, [{identifier, _, 'escape'}], Context, TreeWalker) -> value_ast(Variable, true, Context, TreeWalker#treewalker{safe = true}); filter_ast_noescape(Variable, [{identifier, _, 'safe'}], Context, TreeWalker) -> value_ast(Variable, true, Context, TreeWalker#treewalker{safe = true}); filter_ast_noescape(Variable, [{identifier, _, 'safeseq'}], Context, TreeWalker) -> value_ast(Variable, true, Context, TreeWalker#treewalker{safe = true}); filter_ast_noescape(Variable, Filter, Context, TreeWalker) -> {{VariableAst, Info1}, TreeWalker2} = value_ast(Variable, true, Context, TreeWalker), {VarValue, Info2} = filter_ast1(Filter, VariableAst, Context), {{VarValue, merge_info(Info1, Info2)}, TreeWalker2}. filter_ast1([{identifier, _, Name}, {string_literal, _, ArgName}], VariableAst, #dtl_context{ binary_strings = true } = Context) -> filter_ast2(Name, VariableAst, [binary_string(unescape_string_literal(ArgName))], [], Context); filter_ast1([{identifier, _, Name}, {string_literal, _, ArgName}], VariableAst, #dtl_context{ binary_strings = false } = Context) -> filter_ast2(Name, VariableAst, [erl_syntax:string(unescape_string_literal(ArgName))], [], Context); filter_ast1([{identifier, _, Name}, {number_literal, _, ArgName}], VariableAst, Context) -> filter_ast2(Name, VariableAst, [erl_syntax:integer(list_to_integer(ArgName))], [], Context); filter_ast1([{identifier, _, Name}, ArgVariable], VariableAst, Context) -> {ArgAst, ArgVarName} = resolve_variable_ast(ArgVariable, Context), filter_ast2(Name, VariableAst, [ArgAst], [ArgVarName], Context); filter_ast1([{identifier, _, Name}], VariableAst, Context) -> filter_ast2(Name, VariableAst, [], [], Context). filter_ast2(Name, VariableAst, [], VarNames, #dtl_context{ filter_modules = [Module|Rest] } = Context) -> case lists:member({Name, 1}, Module:module_info(exports)) of true -> {erl_syntax:application(erl_syntax:atom(Module), erl_syntax:atom(Name), [VariableAst]), #ast_info{var_names = VarNames}}; false -> filter_ast2(Name, VariableAst, [], VarNames, Context#dtl_context{ filter_modules = Rest }) end; filter_ast2(Name, VariableAst, [Arg], VarNames, #dtl_context{ filter_modules = [Module|Rest] } = Context) -> case lists:member({Name, 2}, Module:module_info(exports)) of true -> {erl_syntax:application(erl_syntax:atom(Module), erl_syntax:atom(Name), [VariableAst, Arg]), #ast_info{var_names = VarNames}}; false -> filter_ast2(Name, VariableAst, [Arg], VarNames, Context#dtl_context{ filter_modules = Rest }) end. search_for_escape_filter(Variable, Filter, #dtl_context{auto_escape = on}) -> search_for_safe_filter(Variable, Filter); search_for_escape_filter(_, _, #dtl_context{auto_escape = did}) -> off; search_for_escape_filter(Variable, [{identifier, _, 'escape'}] = Filter, _Context) -> search_for_safe_filter(Variable, Filter); search_for_escape_filter({apply_filter, Variable, Filter}, _, Context) -> search_for_escape_filter(Variable, Filter, Context); search_for_escape_filter(_Variable, _Filter, _Context) -> off. search_for_safe_filter(_, [{identifier, _, 'safe'}]) -> off; search_for_safe_filter(_, [{identifier, _, 'safeseq'}]) -> off; search_for_safe_filter({apply_filter, Variable, Filter}, _) -> search_for_safe_filter(Variable, Filter); search_for_safe_filter(_Variable, _Filter) -> on. resolve_variable_ast(VarTuple, Context) -> resolve_variable_ast(VarTuple, Context, 'find_value'). resolve_variable_ast({attribute, {{identifier, _, AttrName}, Variable}}, Context, FinderFunction) -> {VarAst, VarName} = resolve_variable_ast(Variable, Context, FinderFunction), {erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(FinderFunction), [erl_syntax:atom(AttrName), VarAst]), VarName}; resolve_variable_ast({variable, {identifier, _, VarName}}, Context, FinderFunction) -> VarValue = case resolve_scoped_variable_ast(VarName, Context) of undefined -> erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(FinderFunction), [erl_syntax:atom(VarName), erl_syntax:variable("Variables")]); Val -> Val end, {VarValue, VarName}; resolve_variable_ast(What, _Context, _FinderFunction) -> error_logger:error_msg("~p:resolve_variable_ast unhandled: ~p~n", [?MODULE, What]). resolve_scoped_variable_ast(VarName, Context) -> lists:foldl(fun(Scope, Value) -> case Value of undefined -> proplists:get_value(VarName, Scope); _ -> Value end end, undefined, Context#dtl_context.local_scopes). format(Ast, Context, TreeWalker) -> auto_escape(format_number_ast(Ast), Context, TreeWalker). format_number_ast(Ast) -> erl_syntax:application(erl_syntax:atom(erlydtl_filters), erl_syntax:atom(format_number), [Ast]). auto_escape(Value, _, #treewalker{safe = true}) -> Value; auto_escape(Value, #dtl_context{auto_escape = on}, _) -> erl_syntax:application(erl_syntax:atom(erlydtl_filters), erl_syntax:atom(force_escape), [Value]); auto_escape(Value, _, _) -> Value. firstof_ast(Vars, Context, TreeWalker) -> body_ast([lists:foldr(fun ({L, _, _}=Var, []) when L=:=string_literal;L=:=number_literal -> Var; ({L, _, _}, _) when L=:=string_literal;L=:=number_literal -> erlang:error(errbadliteral); (Var, []) -> {'ifelse', Var, [Var], []}; (Var, Acc) -> {'ifelse', Var, [Var], [Acc]} end, [], Vars)], Context, TreeWalker). ifelse_ast(Expression, {IfContentsAst, IfContentsInfo}, {ElseContentsAst, ElseContentsInfo}, Context, TreeWalker) -> Info = merge_info(IfContentsInfo, ElseContentsInfo), {{Ast, ExpressionInfo}, TreeWalker1} = value_ast(Expression, false, Context, TreeWalker), {{erl_syntax:case_expr(erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(is_true), [Ast]), [erl_syntax:clause([erl_syntax:atom(true)], none, [IfContentsAst]), erl_syntax:clause([erl_syntax:underscore()], none, [ElseContentsAst]) ]), merge_info(ExpressionInfo, Info)}, TreeWalker1}. with_ast(ArgList, Contents, Context, TreeWalker) -> {ArgAstList, {ArgInfo, TreeWalker1}} = lists:mapfoldl(fun ({{identifier, _, _LocalVarName}, Value}, {AstInfo1, TreeWalker1}) -> {{Ast, Info}, TreeWalker2} = value_ast(Value, false, Context, TreeWalker1), {Ast, {merge_info(AstInfo1, Info), TreeWalker2}} end, {#ast_info{}, TreeWalker}, ArgList), NewScope = lists:map(fun({{identifier, _, LocalVarName}, _Value}) -> {LocalVarName, erl_syntax:variable(lists:concat(["Var_", LocalVarName]))} end, ArgList), {{InnerAst, InnerInfo}, TreeWalker2} = body_ast(Contents, Context#dtl_context{local_scopes = [NewScope|Context#dtl_context.local_scopes]}, TreeWalker1), {{erl_syntax:application( erl_syntax:fun_expr([ erl_syntax:clause(lists:map(fun({_, Var}) -> Var end, NewScope), none, [InnerAst])]), ArgAstList), merge_info(ArgInfo, InnerInfo)}, TreeWalker2}. regroup_ast(ListVariable, AttributeName, LocalVarName, Contents, Context, TreeWalker) -> {{ListAst, ListInfo}, TreeWalker1} = value_ast(ListVariable, false, Context, TreeWalker), NewScope = [{LocalVarName, erl_syntax:variable(lists:concat(["Var_", LocalVarName]))}], {{InnerAst, InnerInfo}, TreeWalker2} = body_ast(Contents, Context#dtl_context{ local_scopes = [NewScope|Context#dtl_context.local_scopes] }, TreeWalker1), {{erl_syntax:application( erl_syntax:fun_expr([ erl_syntax:clause([erl_syntax:variable(lists:concat(["Var_", LocalVarName]))], none, [InnerAst])]), [erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(regroup), [ListAst, erl_syntax:atom(AttributeName)])]), merge_info(ListInfo, InnerInfo)}, TreeWalker2}. for_loop_ast(IteratorList, LoopValue, Contents, {EmptyContentsAst, EmptyContentsInfo}, Context, TreeWalker) -> Vars = lists:map(fun({identifier, _, Iterator}) -> erl_syntax:variable(lists:concat(["Var_", Iterator])) end, IteratorList), {{InnerAst, Info}, TreeWalker1} = body_ast(Contents, Context#dtl_context{local_scopes = [ [{'forloop', erl_syntax:variable("Counters")} | lists:map( fun({identifier, _, Iterator}) -> {Iterator, erl_syntax:variable(lists:concat(["Var_", Iterator]))} end, IteratorList)] | Context#dtl_context.local_scopes]}, TreeWalker), CounterAst = erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(increment_counter_stats), [erl_syntax:variable("Counters")]), {{LoopValueAst, LoopValueInfo}, TreeWalker2} = value_ast(LoopValue, false, Context, TreeWalker1), CounterVars0 = case resolve_scoped_variable_ast('forloop', Context) of undefined -> erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(init_counter_stats), [LoopValueAst]); Value -> erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(init_counter_stats), [LoopValueAst, Value]) end, {{erl_syntax:case_expr( erl_syntax:application( erl_syntax:atom('erlydtl_runtime'), erl_syntax:atom('forloop'), [erl_syntax:fun_expr([ erl_syntax:clause([erl_syntax:tuple(Vars), erl_syntax:variable("Counters")], none, [erl_syntax:tuple([InnerAst, CounterAst])]), erl_syntax:clause(case Vars of [H] -> [H, erl_syntax:variable("Counters")]; _ -> [erl_syntax:list(Vars), erl_syntax:variable("Counters")] end, none, [erl_syntax:tuple([InnerAst, CounterAst])]) ]), CounterVars0, LoopValueAst]), [erl_syntax:clause( [erl_syntax:tuple([erl_syntax:underscore(), erl_syntax:list([erl_syntax:tuple([erl_syntax:atom(counter), erl_syntax:integer(1)])], erl_syntax:underscore())])], none, [EmptyContentsAst]), erl_syntax:clause( [erl_syntax:tuple([erl_syntax:variable("L"), erl_syntax:underscore()])], none, [erl_syntax:variable("L")])] ), merge_info(merge_info(Info, EmptyContentsInfo), LoopValueInfo) }, TreeWalker2}. ifchanged_ast(ParseTree, {IfContentsAst, IfContentsInfo}, {ElseContentsAst, ElseContentsInfo}, _Context, TreeWalker) -> SourceText = lists:flatten(erlydtl_unparser:unparse(ParseTree)), {{erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(ifchanged), [erl_syntax:string(SourceText), IfContentsAst, ElseContentsAst]), merge_info(IfContentsInfo, ElseContentsInfo)}, TreeWalker}. cycle_ast(Names, Context, TreeWalker) -> {NamesTuple, VarNames} = lists:mapfoldl(fun ({string_literal, _, Str}, VarNamesAcc) -> {{S, _}, _} = string_ast(unescape_string_literal(Str), Context, TreeWalker), {S, VarNamesAcc}; ({variable, _}=Var, VarNamesAcc) -> {V, VarName} = resolve_variable_ast(Var, Context), {V, [VarName|VarNamesAcc]}; ({number_literal, _, Num}, VarNamesAcc) -> {format(erl_syntax:integer(Num), Context, TreeWalker), VarNamesAcc}; (_, VarNamesAcc) -> {[], VarNamesAcc} end, [], Names), {{erl_syntax:application( erl_syntax:atom('erlydtl_runtime'), erl_syntax:atom('cycle'), [erl_syntax:tuple(NamesTuple), erl_syntax:variable("Counters")]), #ast_info{ var_names = VarNames }}, TreeWalker}. %% Older Django templates treat cycle with comma-delimited elements as strings cycle_compat_ast(Names, Context, TreeWalker) -> NamesTuple = lists:map(fun ({identifier, _, X}) -> {{S, _}, _} = string_ast(X, Context, TreeWalker), S end, Names), {{erl_syntax:application( erl_syntax:atom('erlydtl_runtime'), erl_syntax:atom('cycle'), [erl_syntax:tuple(NamesTuple), erl_syntax:variable("Counters")]), #ast_info{}}, TreeWalker}. now_ast(FormatString, Context, TreeWalker) -> % Note: we can't use unescape_string_literal here % because we want to allow escaping in the format string. % We only want to remove the surrounding escapes, % i.e. \"foo\" becomes "foo" UnescapeOuter = string:strip(FormatString, both, 34), {{StringAst, Info}, TreeWalker1} = string_ast(UnescapeOuter, Context, TreeWalker), {{erl_syntax:application( erl_syntax:atom(erlydtl_dateformat), erl_syntax:atom(format), [StringAst]), Info}, TreeWalker1}. spaceless_ast(Contents, Context, TreeWalker) -> {{Ast, Info}, TreeWalker1} = body_ast(Contents, Context, TreeWalker), {{erl_syntax:application( erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(spaceless), [Ast]), Info}, TreeWalker1}. unescape_string_literal(String) -> unescape_string_literal(string:strip(String, both, 34), [], noslash). unescape_string_literal([], Acc, noslash) -> lists:reverse(Acc); unescape_string_literal([$\\ | Rest], Acc, noslash) -> unescape_string_literal(Rest, Acc, slash); unescape_string_literal([C | Rest], Acc, noslash) -> unescape_string_literal(Rest, [C | Acc], noslash); unescape_string_literal("n" ++ Rest, Acc, slash) -> unescape_string_literal(Rest, [$\n | Acc], noslash); unescape_string_literal("r" ++ Rest, Acc, slash) -> unescape_string_literal(Rest, [$\r | Acc], noslash); unescape_string_literal("t" ++ Rest, Acc, slash) -> unescape_string_literal(Rest, [$\t | Acc], noslash); unescape_string_literal([C | Rest], Acc, slash) -> unescape_string_literal(Rest, [C | Acc], noslash). full_path(File, DocRoot) -> case filename:absname(File) of File -> File; _ -> filename:join([DocRoot, File]) end. %%------------------------------------------------------------------- %% Custom tags %%------------------------------------------------------------------- tag_ast(Name, Args, Context, TreeWalker) -> {InterpretedArgs, AstInfo} = lists:mapfoldl(fun ({{identifier, _, Key}, {string_literal, _, Value}}, AstInfoAcc) -> {{StringAst, StringAstInfo}, _} = string_ast(unescape_string_literal(Value), Context, TreeWalker), {erl_syntax:tuple([erl_syntax:string(Key), StringAst]), merge_info(StringAstInfo, AstInfoAcc)}; ({{identifier, _, Key}, {trans, StringLiteral}}, AstInfoAcc) -> {{TransAst, TransAstInfo}, _} = translated_ast(StringLiteral, Context, TreeWalker), {erl_syntax:tuple([erl_syntax:string(Key), TransAst]), merge_info(TransAstInfo, AstInfoAcc)}; ({{identifier, _, Key}, Value}, AstInfoAcc) -> {AST, VarName} = resolve_variable_ast(Value, Context), {erl_syntax:tuple([erl_syntax:string(Key), format(AST,Context, TreeWalker)]), merge_info(#ast_info{var_names=[VarName]}, AstInfoAcc)} end, #ast_info{}, Args), {RenderAst, RenderInfo} = custom_tags_modules_ast(Name, InterpretedArgs, Context), {{RenderAst, merge_info(AstInfo, RenderInfo)}, TreeWalker}. custom_tags_modules_ast(Name, InterpretedArgs, #dtl_context{ custom_tags_modules = [], is_compiling_dir = false }) -> {erl_syntax:application(none, erl_syntax:atom(render_tag), [erl_syntax:string(Name), erl_syntax:list(InterpretedArgs), erl_syntax:variable("CustomTagsContext")]), #ast_info{custom_tags = [Name]}}; custom_tags_modules_ast(Name, InterpretedArgs, #dtl_context{ custom_tags_modules = [], is_compiling_dir = true, module = Module }) -> {erl_syntax:application(erl_syntax:atom(Module), erl_syntax:atom(Name), [erl_syntax:list(InterpretedArgs), erl_syntax:variable("CustomTagsContext")]), #ast_info{ custom_tags = [Name] }}; custom_tags_modules_ast(Name, InterpretedArgs, #dtl_context{ custom_tags_modules = [Module|Rest] } = Context) -> case lists:member({Name, 2}, Module:module_info(exports)) of true -> {erl_syntax:application(erl_syntax:atom(Module), erl_syntax:atom(Name), [erl_syntax:list(InterpretedArgs), erl_syntax:variable("CustomTagsContext")]), #ast_info{}}; false -> case lists:member({Name, 1}, Module:module_info(exports)) of true -> {erl_syntax:application(erl_syntax:atom(Module), erl_syntax:atom(Name), [erl_syntax:list(InterpretedArgs)]), #ast_info{}}; false -> custom_tags_modules_ast(Name, InterpretedArgs, Context#dtl_context{ custom_tags_modules = Rest }) end end. options_ast() -> erl_syntax:list([ erl_syntax:tuple([erl_syntax:atom(translation_fun), erl_syntax:variable("TranslationFun")]), erl_syntax:tuple([erl_syntax:atom(locale), erl_syntax:variable("CurrentLocale")]) ]). call_ast(Module, TreeWalkerAcc) -> call_ast(Module, erl_syntax:variable("Variables"), #ast_info{}, TreeWalkerAcc). call_with_ast(Module, Variable, Context, TreeWalker) -> {VarAst, VarName} = resolve_variable_ast(Variable, Context), call_ast(Module, VarAst, #ast_info{var_names=[VarName]}, TreeWalker). call_ast(Module, Variable, AstInfo, TreeWalker) -> AppAst = erl_syntax:application( erl_syntax:atom(Module), erl_syntax:atom(render), [Variable, options_ast()]), RenderedAst = erl_syntax:variable("Rendered"), OkAst = erl_syntax:clause( [erl_syntax:tuple([erl_syntax:atom(ok), RenderedAst])], none, [RenderedAst]), ReasonAst = erl_syntax:variable("Reason"), ErrStrAst = erl_syntax:application( erl_syntax:atom(io_lib), erl_syntax:atom(format), [erl_syntax:string("error: ~p"), erl_syntax:list([ReasonAst])]), ErrorAst = erl_syntax:clause( [erl_syntax:tuple([erl_syntax:atom(error), ReasonAst])], none, [ErrStrAst]), CallAst = erl_syntax:case_expr(AppAst, [OkAst, ErrorAst]), with_dependencies(Module:dependencies(), {{CallAst, AstInfo}, TreeWalker}).